Impetus

Webster's Dictionary of the English Language

·noun Fig.: Impulse; incentive; vigor; force.

II. Impetus ·noun The aititude through which a heavy body must fall to acquire a velocity equal to that with which a ball is discharged from a piece.

III. Impetus ·noun A property possessed by a moving body in virtue of its weight and its motion; the force with which any body is driven or impelled; momentum.

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